Date: Tue, 09 Dec 2003 23:57:07 -0500
From: Joe <joe-AT-dunfee.com>
Subject: PUPT: Vacuumformers


  Yes, the 11x17 runs off a small shop vac.  However, it is actually a
two-stage system; The shop vac does the majority of the air, then a valve
closes automatically and hand-operated pump (converted from a bicycle pump)
does the final bit of air. 

  I should point out that I am really not an expert on the process, and
haven't really done much with mine. But, I suspect for masks that the
stronger vacuum is important because it helps keep the details.  The other
factor is the thickness of the plastic.

  Also, there are certainly a few tricks which are not apparent.  The main
one being that one deep objects, a structure that almost looks like a
"flying buttress" forms on the sides.  The way to avoid them forming on the
actual object is to lift the object something like 1/2" off of the vacuum
table.  This can be accomplished by just putting plywood underneath and cut
to the profile of the object.

  I got my 11x17 model from a small mail-order company that doesn't seem to
exist now.  I think the web site was http://www.vacuform.com [or is that
with two "u"'s?]

  I know this book has a detailed description of making one; The Prop
Builder's Molding & Casting Handbook by Thurston James.

As for hobbiest, who are the people most likely to put their own home-made
design on the web, there are the R/C car hobbiest, and the Sci-Fi costume
hobbiest.  Here are some links to costumers;

http://www.furnation.com/nakira/cost/
http://www.studiocreations.com/stormtrooper/main.shtml

Joe Dunfee  joe-AT-dunfee.com
Gordonville, Pennsylvania, U.S.A.



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